In this document, we revise stock status assessments of D. eleginoides in research blocks C and D using CPUE analogy method, Petersen method and CASAL models following the methods recommended at the last WG-FSA meeting, although the survey for the current season has not been conducted yet. Detailed results using CASAL models in research block C are described in a separated document. The Shinsei maru No. 3 will conduct the research in June for the current (2013/14) season, thus we would submit updated data to the next WG-FSA meeting.
The estimated stock size in block C was 753, 428 and 667 tonnes in CPUE analogy method, Petersen method and CASAL Len model (vulnerable biomass in 2013), respectively.
The stock sizes of D. eleginoides in block D is estimated at 840 tonnes only by using CPUE method, as the catch and tagging data in block D was not enough to be applied to Petersen method and CASAL models.
We propose to continue the current research operation for the next fishing season with the same survey design and sample size of 60 tonnes in order to further strengthen the stock assessments in the area.